Electrical driving pendulum device



BEST AVAILABLE cob .J. H. GERAGHTY ELECTRICAL DRIVING PENDULUM DEVICE Filed 0012.22, 1924 Nov. 9",1926. 1,605,935

Patented Nov. 9, 1926.

UNITED STATES AILABLE com JOHN H. GERAGI-ITY, OF CHICAGO, ILLINOIS.

ELECTRICAL DRIVING PENDULUM DEVICE.

Application filed October 22, 1924. Serial No. 745,266.

The main object of this invention is to provide an animated show card which can be connected to and operated by any commercial electrical circuit; to provide an improved electric mechanical mechanism for operating the show card; to provide a compound pendulum linked to the animated elements, and a second or impulse pendulum which delivers a driving impulse to the com pound pendulum through the action of a ixed electro-magnet upon a'moving armature secured to the impulse pendulum; to provide an impulse pendulum which is not connected in the electrical circuit, and which does not control the make and break coniacts of the electrical circuit; to provide a simple inexpensive electrically driven,'pendulum operatedmecha'nism which will maintain itself in operation for an indefiniteperiod without manipulation or adjustment; to provide a crude but'substantial make and break contact which is operatedby the compound pendulum when'said pendulum is its position of maximum velocity. l

An illustrative embodiment of this invention is shown by the accompanying drawings in which: i f

Fig. 1 is a front perspective'view of a show card in which the driving mechanism is concealed and the driven parts are visible.

Fig. 2 is a diagrammatic sketch of the rear view of Fig. 2 showing the driving mechanism in one position.

Fig. 3 shows the driving mechanism with the electrical contact broken.

In Fig. 1 the driven arm 1 is pivoted'at a point 2 and at a point 3 and is connected by a link 4 with the driving mechanism shown in Fig. 2. In Fig. 2 the driving mechanism is assembled upon a board 5, and comprises a compound pendulum 6 mounted on a pivot or suspension 7. A projection on the compound pendulum carries the pivot 8 to which is secured the link 4:. At the lower end of the pendulum 6 is fastened a weight 9 which operates as the lower bob of the compound pendulum. The position of the weight 9 is adjusted at the time of construction so that at the rest position of the compound pendulum 6 the suspension bar 10 hangs in a vertical line.

An electro-magnet 11 is secured to the board 5 in such position that the face of the electro-magnet 11 is in line with a radius drawn from the point of suspension 7. Current is supplied to the electro-magnet from the main line by a circuit 12 which is completed by a light flexible wire 18 which is connected to a thin metal bar 14. The metal bar 1% is in turn carried by guide slots in brackets 15 and 16. Cams 17 forming an integral part of the bar 14- are arranged to coact with the pin 18 on the compound pendulum 6. One end of the bar 14: carries a pencil carbon 18 which rides over a fixed pencil carbon 19. The fixed pencil carbon 19 is electrically connected to the main line through wire 20. The outstanding feature of this invention isa second impulse pendulum 21 which is independent of the compound pendulum 6 but is supported in this illustrative embodiment on the same suspension 7. 1

The impulse pendulum 21* has a very much shorter period of oscillation than the compound pcndulum and the impulse pendulum 21 carries an=armature 22, which armature forms aclip'which coacts with the compound pendulum Gaiid'thtorigh which a ine-chanical impulse is delivered by the im' ulse pendulum'21to the compound pendu um; 6 at a-predetermined' position of both pendulums.

Thefiiov'elty'of this invention resides-in the 'factvthat' in operation; the impulse pendulunr21 'isacted upon 1 by a magnetic flux from"tlieelectro-magnet 11 and that the impulse pendulum is-free to swing under the impulse of the magnetic flux, and that when the impulse pendulum has reached the position of desired tractive effort between the electro-magnet 11 and the moving armature 22, that the combined tractive eifort of the electro-magnet and the momentum of the pendulum 21 are delivered to the compound pendulum 6, the impulse being given at the time when the suspension bar 10 is in its vertical position and at its position of maximum velocity.

From construction, the electrical circuit through the solenoid 11 is completed at the carbon pencil contacts 18 and 19 before the suspension bar 10 reaches its full sway away from the solenoid 11. At the time of closure of the circuit the tractive effort of the solenoid 11 on the armature 22 is negligible because of the long air gap. The impulse pendulum 21 does not engage the suspension bar 10 to give an effective pull until the suspension bar is passing the central osition toward the solenoid.

This simple arrangement of a separate armature carrying pendulum controlled by an electro-magnet in a circuit ,in which. the electrical contact is quickly broken with a snap switch effect by the compound pendu lum gives a construction which is depend' able in operation and eliminates all close adjustments. This result issecuredby engagement of the pin. 18, with the cam 17 which in turn breaks the contact bet-ween the carbon. pencils 18 and 19, the position of. the camel? being so arranged that the pin 18 strikes the cam 17 when the pendu lum is at its center position or nia xiinum velocity and when the impulse pendulum is atitsv nearest approach. to thecore of the electro-magnet 11, at which point the, con tact, is sharply broken, the impulsependurum-is stopped by the impact and. is free to. oscillate. The compound pendulum in its returinswing closes the electrical circuit by engagement of the pin 1 8. with the re. turn, cam 17, thus repeating the. operation.

In operation, this invention provides a very positive, and reliable electro -cmechanicalmechanism without. requiring. any, close adjustments of any kind. The position, of the, cam 17 is located by the sw ng ifthe cvompound pendulum. The bend; o the metal clip: which forms the armature on heimpes r ndam e -s. h m if c between; he 912 8- ne d lii il n h compound pendulum at the position of maximum, velocity. of the compound pen: dulum and when once set requires no furthere adjustment or manipulation. Ex;- perience has proven that this, simple v arrangement Will,continue in operation for a o g t mew hi i b teet ell t -ma n nce an entire y w ut flii s m n It w l beappa z nt a he e i l th al i l 1,605,935, BEST AVAILABLE COP;

the illustratiye embodiment of this inven tion, here disclosed, includes an animated show card, and that the same drivingmechw nism is adapted for use in any pendulum drivingoriregulating device where reliabil- 1 ity t operation, economy of construction, and absence.of-fine adjustmentis required.

Altheugh but one specific embodiment of this invention has been herein shown and described, it will be understood that numerous details of the construction shown may be altered or omitted without departing i'ronrth'e spirit of this invention as defined bythe following claims.

l laim;

1, An oscillating exhibition mechanism comprising a compound pendulum of long RQIglQQhdlIiliflQB between moving figures and saidcem-po'undpendulum, a make and break Contact; controlled by said compound pendului'n, an impulse pendulum of relatively short period, an armature on said impulse pendulum, means to deliver a mechanical lllgplllfi f lOm said impulse pendulum to said compound pendulum, an electro-mag net, in circuit with said make and break contact, exerting a tractiye force on said armature, when sa d compound pendulum is atjth' 'c e 1;1ter of its swing. Kn'osqillatingdriying mechanism com p r isiiigor,"a compound; pendulum, an impulse pendu um, an armature on sa d impulse pendulum, means to deliver the momentum of the impulse. pendulum to said compound pendulum at the position, oi the maximum velocity of saidcompound pendulum.

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